Atomic Structure Part II

1
Atomic Structure Part II

• Objectives 6 - 10

2
Atomic Number

• Equal to the number of PROTONS
• Determines the type of atom you have
• All atoms of an element have same of protons

3
What else this tells you

• In an ATOM protons electrons
• Positive Negative so total is ZERO
• Atoms have a charge of ZERO

4
Mass Number

• Mass number Protons Neutrons
• Total number of NUCLEONS!!!

• Why doesnt it count the electrons???

5
Isotopes

• What does ISO mean?
• Atoms of the same element this tells us what???
• What could possibly be different???

6
Atomic Mass

• But the Atomic Mass listed on the Periodic Table
  is not a whole number?
• It is an average of the Naturally Occurring
  Isotopes
• Also takes into account their relative abundance
  (what?).

7
Atomic Mass Calculation

• Chlorine has two common isotopes
• Chlorine-37 and Chlorine-35
• 37Cl 25
• 35Cl 75
• (37 X 0.25) (35 X 0.75) a.m.